Patent US4735692A successfully refreshed from Google Patents.
US4735692A
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Phosphate selective membrane electrode and method of determining phosphate
Assignee: University of Iowa Research Foundation
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Filing: 1987-04-08
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Granted: 1988-04-05
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Expires: 2007-04-08
Abstract
Abstract A novel ion-selective membrane electrode for the determination of phosphate anions. This device possesses an excellent selectivity for phosphate over many common anions such as sulfate, chloride, bromide, iodide, nitrate, and acetate. The unique feature of this electrode is the use of a di-substituted aryl tin compound as the membrane active material. The incorporation of either dibenzyltin dichloride or bis-p-methylbenzyltin dichloride in a plasticized poly(vinyl) chloride membrane results in a selective membrane electrode for phosphate.
Inventors
- 👤 Mark A. Arnold
- 👤 Scott A. Glazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:23
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
67 words
A phosphate ion selective membrane electrode comprising: a body member having an opening therein; a membrane sealably attached to said body member over said opening, said membrane including a di-substituted aryl tin compound selected from a group consisting of dibenzyltin dichloride and derivatives thereof; a reference solution contained within said body member; and a reference electrode disposed withn said body member in contact with said reference solution.
Claim 2
Dependent Claim
67 words
A phosphate ion selective membrane electrode comprising: a body member having an opening therein; a membrane sealably attached to said body member over said opening, said membrane including a di-substituted aryl tin compound selected from a group consisting of dibenzyltin dichloride and derivatives thereof; a reference solution contained within said body member; and a reference electrode disposed withn said body member in contact with said reference solution.
Claim 3
Dependent Claim
23 words
A method of determining the phosphate anion in a sample including the step of: contacting said sample with the electrode of claim 1.
References Cited (Backward Citations)
US3445365A
Cited
SU842546A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |